新型內(nèi)饋式轉(zhuǎn)子勵(lì)磁高壓風(fēng)力發(fā)電機(jī)及其并網(wǎng)控制研究
[Abstract]:With the flourishing development of power electronics technology, the functions of generators and their energy exchange devices have become more mature. The power conversion level of wind turbines has leaped from the basic kilowatt level to the megawatt level. Especially with the flourishing development of offshore wind power, the study of high-voltage and large-capacity wind turbines has become the wind of today and even in the future. Nowadays, the high-voltage wind power generation system is composed of the following combinations: one is composed of high-voltage wind generator and high-voltage converter; the other is composed of low-voltage wind generator, low-voltage converter and transformer. However, with the expansion of generator capacity, the lower output voltage at the stator end of the generator will lead to the higher output current. This not only requires more cables and copper bars, but also makes the production process of the wind turbine more complicated. In order to solve the problem of high-voltage wind turbines, it is necessary to add a step-down transformer to the grid-side converter before it is connected with the grid, which undoubtedly increases the manufacturing cost and operation cost of the system. The main research work and innovations are as follows: (1) Based on the structure and working principle of doubly-fed wind induction machine (DFIG), a new type of internal-fed rotor-excited high-voltage wind generator (IFREG) is proposed. The stator winding is the main winding of the high-voltage stator, and the output end can be directly connected to the large power grid to output constant frequency and constant amplitude AC high voltage; the other is the low-voltage stator auxiliary winding, connected to the stator-auxiliary side PWM converter, through the DC bus, the rotor-side PWM converter can input excitation current to the generator, which solves the problem of internal-fed rotor-excited high-voltage generator in wind speed and wind speed. Through the corresponding excitation start-up control strategy, flexible grid-connected control strategy and steady-state operation control strategy, IFREG can effectively maintain the frequency and amplitude of the stator-end induced voltage, cancel or reduce the number of transformers, and effectively reduce the cost of the system. ( 2) A 6 kV, 440 kW prototype is designed according to the requirement of the project, and its sub-synchronous, synchronous and super-synchronous finite element simulation experiments are carried out under no-load and load conditions by using finite element method. The feasibility of IFREG in the field of variable speed constant frequency (VSCF) is verified in principle. (3) The number of IFREG power generation system in ABC and DQ coordinates is deduced systematically. The mathematic model of IFREG is established, and the simulation analysis of IFREG under different rotational speeds is carried out. The simulation results are basically the same as the finite element simulation results, which verify the accuracy of the mathematic model. In the off-grid state, the high-voltage output with stable frequency amplitude can be obtained at the stator end of the internal-fed rotor-excited high-voltage wind turbine under different wind speeds. (4) The mathematical model of the PWM converter at the stator-auxiliary side of the internal-fed rotor-excited high-voltage wind power generation system under the grid voltage stability is studied, and the PWM converter at the stator-auxiliary side is discussed. Based on the double closed loop control strategy, a power compensation control strategy of stator-auxiliary converter based on excitation start-up power supply is proposed. The operation mechanism of rotor-side converter in IFREG power generation system under grid voltage stability is deduced. On this basis, different from ordinary doubly-fed wind turbine is proposed. Based on the stator flux oriented vector control method and the maximum wind energy tracking control strategy. (5) A grid-connected control program and control strategy matching the IFREG system are proposed. A simulation model of IFREG system under constant grid-side voltage is established. The excitation start-up performance, flexible grid-connected performance, load steady-state operation, active and reactive power of the IFREG power generation system are analyzed. (6) In order to verify the operation characteristics of IFREG in VSCF power generation, a 440kW, 6kV internal-fed rotor-excited high-voltage wind power generator prototype was developed, and a system experimental platform was built. A set of power electronics for internal-fed rotor-excited high-voltage wind power generation system was completed. Experiments on excitation start-up performance, flexible grid-connection performance, steady-state load operation and active and reactive power decoupling control are carried out on the experimental platform. The experimental results are in agreement with the simulation results, which prove the feasibility of IFREG and its power generation system and the correctness of the control strategy proposed in this paper.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM315
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